SMJ100A signal generator

Wednesday, 05 October, 2005 | Supplied by: Rohde & Schwarz (Australia) Pty Ltd

Rohde & Schwarz has rounded out its range of R&S SMx products with the SMJ100A all-purpose signal generator.

The vector instrument is suitable for use in development as well as production. The instrument provides a high signal quality and flexibility required in development and is suitable for use in production, due to its short setting times and flexible baseband that provides a wide range of real-time signals or replays precalculated waveforms.

With the 100 kHz to 3 GHz (or 100 kHz to 6 GHz) frequency option, the device covers all frequency bands that are important in digital RF transmission. The internal optional baseband generator can handle a large number of digital standards. For example, it supports GSM/EDGE, 3 GPP FDD including HSDPA, CDMA2000, WLAN IEEE 802.11a/b/g as well as WiMAX.

Simulation Software R&S WinIQSIM and Matlab are supported by the internal arbitrary waveform generator, which offers sequences up to 64 MSa in length, expanding the standard range by 3GPP TDD and OFDM, for example.

If the internal baseband generator is used, the unit provides signals with a bandwidth up to 80 MHz - sufficient for the next generation of broadband transmission methods. In addition, analog I/Q signals can be fed in. For these signals, a modulation bandwidth of up to 200 MHz is available.

The low SSB phase noise of -129 dBc (at 20 kHz carrier offset and 1 GHz carrier frequency) documents the signal quality. With 3GPP FDD (test model 1/64), the adjacent channel leakage ratio (ACLR) is typically 69 dB.

The generator provides short settling times of less than 5 ms, which are reduced to 450 µs in a special list mode. The wear-free electronic attenuator allows a quick level change over the entire frequency range.

The large colour display (800 x 600 pixels) shows the signal flow inside the instrument through a block diagram. Each functional unit, such as RF or baseband, is assigned a separate block. Active components are highlighted in colour. Menu-guided operation of the R&S SMJ100A also uses the display's graphical possibilities. It is based on a window structure used by modern PC operating systems, allowing a number of windows to be active simultaneously.

A WinBar enables the user to switch quickly from one window to another. The context-sensitive online help provides additional support.

Besides the RF output, the instrument also features differential I/Q outputs - which are used, for example, for tests if the DUT is not yet equipped with an RF front end or if only the baseband module's performance is to be tested.

Phone: 02 8874 5100
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